Sigh, I may not drive anymore, or own a vehicle for that matter, but I do maintain & upgrade the two that my partner has around. Selvia is the little 4 banger of a `01 Subaru Forester L (Forest green too!) & Mozey (pronounced Mo-Z) is the 1986 Chevy camper conversion "Get-Away" van from Canukia, I mean Canada eh...
The Subi is easy, she gets taken to the guy with all the fancy computers & software to have anything more than an oil change or fill up the gas.
The Chevy, Mozey, is my baby! Got him and had the engine worked on a bit by a local gearhead so the engine was running properly, then the fun began! The electrical system for the van was working fine, but the electrical wiring in the back was a nightmare at best & a hazard waiting to melt the whole thing at the worst. So after the first season of not having things work correctly, or at all, I got the permission from the partner to retrofit the entire backends' electrical system! First I pulled out a rainbow wire that fed power to the backend, SEVEN colors, 4 wire gauges, one section held to another by various methods. My favorite being a couple of ring terminals held together with a nut & bolt wrapped in duct tape. New solenoid that I installed to only supply power when key is on & not at all times (isolating the batteries when the key is off), new wiring all around, additional wiring all over, new fuses, LED lighting installed in and out, even a new power center & battery. Now he's got enough lights inside to be visible from 300 meters through trees, shrubs & brush. Then there is the LED spot lamp I installed, we tested it by turning it on then pacing the distance, we got to 600 meters roughly, sadly we had to stop because we had reached the edge of the cliff, otherwise it'd be another couple hundred meters I bet!